Preemies?

My son was four weeks early. his due date was just two days ago and it seems like he’s just gotten fussy, before he NEVER cried unless i miss his hunger cues and he got pretty hungry. but today he’s been getting so worked up over what seems like nothing, and wants to be held constantly. is it because he’s finally hit his due date and this is normal newborn behavior or is it normal with him being 4 weeks old? my first was pretty fussy from day one (reflux) and needed to be held CONSTANTLY so i don’t know if i’m ready to compare the two yet lol